I think it's the thin end of the wedge when you have armed police permanently on patrol round a city.

我觉得让武装警察永久性地在城市里巡逻是老鼠拉木锨，大头在后边。

柯林斯例句

Insert the thin end of the wedge.

打进楔子尖,(比喻)微微突破一点(以便慢慢扩大作用).

辞典例句

The thin end of the wedge is dangerous.

楔的细端是危险的.

互联网

She's on the thin end of the wedge.

她的状况开始不妙了.

互联网

If the cost of steel rises it is usually the thin end of the wedge.

如果钢价上涨那么许多产品的价格也会上涨.

互联网